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Open Roads Forum  >  Beginning RVing

 > One night running the heater and blower

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cavie

Port Charlotte Fl/ Hindsdale MA

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Posted: 05/25/19 03:08am Link  |  Quote  |  Print  |  Notify Moderator

Boon Docker wrote:

way2roll wrote:



One note, open a bath roof vent or something. A by product of LP burning is water vapor and will drive up the humidity in your RV.


No need to open a vent. Running a furnace does not produce water vapor inside the trailer.


Yes it does. We must run a 30 QT dehumidifier with the heater on or watch the water slide down the glass onto the walls. We don't open a vent.


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ktmrfs

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Posted: 05/25/19 09:21am Link  |  Quote  |  Print  |  Notify Moderator

bikendan wrote:

rvshrinker wrote:

How do you run the microwave and outlets without shore power? What is an inverter?


normally, you'd need an inverter generator.

but if you have a big battery bank and a big inverter, you might be able to run the microwave for a few minutes.

to run the outlets, the inverter would have to be wired into the RV's 110v AC electrical side. this would not be an easy task.

an inverter inverts 12v DC battery power to 110v AC power.
most just use an inverter plugged into the 12v cigarette lighter socket and plug a tv or electronic devices into the inverter.


I have a 1000W inverter wired directly to the battery bank then to a transfer switch in my system. The inverter transfer switch provides power to the microwave circuit, the outlets for TV etc. but NOT the AC, HWH, Fridge or converter.

As for running the microwave for a "few minutes". In reality I could run the microwave for an hour or so before running down the batteries. I run a panasonic true inverter microwave set to 50% power (1000VA) when using the inverter. Draws about 90A. On a 220AH battery bank that translates to about an hour of run time accounting for the AH on a high draw. Typically it is used for a few minutes at a time to warm vegies, DW tea, my coffe, etc. or warm up a meal at a rest stop.


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ktmrfs

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Posted: 05/25/19 09:25am Link  |  Quote  |  Print  |  Notify Moderator

cavie wrote:

Boon Docker wrote:

way2roll wrote:



One note, open a bath roof vent or something. A by product of LP burning is water vapor and will drive up the humidity in your RV.


No need to open a vent. Running a furnace does not produce water vapor inside the trailer.


Yes it does. We must run a 30 QT dehumidifier with the heater on or watch the water slide down the glass onto the walls. We don't open a vent.


well, the water is NOT coming from the furnace or you have a real safety problem. the furnace or WH combustion is seperated from the inside venting. Same as a house, it goes up the vent stack. so NO water vapor goes into the living area. If combustion air is exhausted into the living area CO poisoning is a REAL possiblity.

Now the stove/oven will emit water vapor into the living area, but NOT the furnace or HWH.

What you are likely experiencing is air circulation from the furnace fan causing air near the dew point to hit the windows, and then condensing.

Unvented cat heater stove/oven another story. They do put water vapor inside the trailer. Slightly less than gallon of water for every gallon of propane burned.

* This post was edited 05/25/19 11:56am by ktmrfs *

Boon Docker

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Posted: 05/25/19 10:18am Link  |  Quote  |  Print  |  Notify Moderator

cavie wrote:

Boon Docker wrote:

way2roll wrote:



One note, open a bath roof vent or something. A by product of LP burning is water vapor and will drive up the humidity in your RV.


No need to open a vent. Running a furnace does not produce water vapor inside the trailer.


Yes it does. We must run a 30 QT dehumidifier with the heater on or watch the water slide down the glass onto the walls. We don't open a vent.


No it doesn't produce water vapor inside the trailer.
If the furnace itself produced water vapor inside the trailer you would die from the CO that it would also be producing.
You have got something else going on that is producing the humidity.

time2roll

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Posted: 05/25/19 11:04am Link  |  Quote  |  Print  |  Notify Moderator

OP did mention catalytic heater option that most certainly will produce water vapor.
Cooking, bathing, breathing will also produce significant humidity.


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2112

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Posted: 05/25/19 11:11am Link  |  Quote  |  Print  |  Notify Moderator

SoonerWing03 wrote:

Went with 2 group 24 batteries for the short term and just strapped them down good. Set the thermostat to 60 and the heater never once kicked on.... go figure. Lol.
Better to be prepared and not need it than have an angry wife. Glad you got it all sorted out.


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pianotuna

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Posted: 05/25/19 12:11pm Link  |  Quote  |  Print  |  Notify Moderator

What to do about condensation?

The cause of the condensation is the walls are below the dew point temperature. If the walls can be made warm enough the problem disappears. Running a fan to circulate air may help to raise the temperature on the surface of the wall.

One other solution is to reduce the relative humidity inside the RV.

The easiest way to do that is to open a roof vent a bit, find the furthest window from the vent and open that a bit. An electric heater near the window will improve that and keep you warmer. I'd suggest a low wattage radiant type, or a small oil filled (if the oil filled can be on a shelf so the air from the window passes over the fins.)

I know opening a vent and window when it is cold seems counter intuitive, but it does work. The colder it is outside the better it works.

Another possible solution is an electric dehumidifier--but the cooler it is the poorer they work. They are generally energy hogs, some what bulky and definitely noisy.


Regards, Don
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DanielCulp

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Posted: 05/28/19 12:10am Link  |  Quote  |  Print  |  Notify Moderator

janstey58 wrote:

At 50 degrees I would have the windows open and enjoy the cool air. Or just use extra blankets and take off the chill in the AM when you wake up. Just other options.


I would have done the same thing.

janstey58

Glenwood, IA

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Posted: 05/28/19 01:36pm Link  |  Quote  |  Print  |  Notify Moderator

The OP even posted that the furnace never even ran, after the fact. LOL!


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K3WE

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Posted: 06/06/19 08:51am Link  |  Quote  |  Print  |  Notify Moderator

janstey58 wrote:

The OP even posted that the furnace never even ran, after the fact. LOL!


Yeah...the thread sort of went the wrong way. But it was also no-win.

He indicated his batteries were old- and there comes a point where turning on the furnace even once won't work.

Were the forecast temperatures pretty mild- Yes. Is it possible he might have wanted a little heat and been bummed not to have it- Also yes.

Should he have gone out and bought two new ones JUST FOR THE SLIGHLY COOL NIGHT? No...

Should he have gone out and bought two new batteries BECAUSE HIS OLD ONES WERE SHOT? Probably. If he wanted to be cheap- maybe only one battery...but agree with your comment!

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